Theftproof lamp



June 24, 1930. SCHMIDT THEFTPROOF LAMP Filed Oct.- 8, 1926 INVENTOR z't/z BY Y JAE/a ATTORNEY i j pose, isentered through theenlarg'ed portion of the slot 29 formed in'the screw threaded member of the base 11 and intothe notch -20,"theresilient member 26 being slightly compressed. thereby. The ball 31 is positioned in the notch 20 withfthe; aid of 'a thin coating r axpr the-like 'which acts to:

temporarily hold this ball 31 in the desired 7 position as shown in'Fig l. Insteadofa spherical memberor ball- 31 a Cylindrical member indicated by; 32 in Fig. 8 maybe provided." With the parts in the position as fshown in Figs 2 and 3, the base'll is'then inserted into the socket; not shown in'detail as the same vis well-known, The bulb [with ,thebasedl'llis then .rotatedfor thegpur" 'ose' 'of inserting the'lamp. "After it has insertedto some extent, the protruding por- Q tion of the ball 31, that-isthat portion which protrudes through the slot29 entersthe cor- V 1; responding registering valley of the socket.

' Uponcontinuedrotation, the base enters j; fullyrinto the socket, without impedance as s ,theprotruding surface of the ba1l31'registersi-with that portion ofithethreaded 'mem- 1 r flbehwhich hasf'been cut away, and glides 7 I alongfthe corresponding valley of the socket will beforc'ed outf of its positioninthe notch 20 and" alonglthe face 21 of the collar l5 thereby becoming fjammedhbetween the cam face 21 andthe socket wall 'SiInultaneously with such jammingthe-base and the socket will be moved ec'centrically'with each other; as *shown diagrammatically in 1 place,- thus bringing their respect ve-threads into close-frictional contact 'andefl'ectively} locking the parts against' turning movement.

F ig. 6,' and also axial displacement of'the base with'relation to the socketwill take Thisijamming of the ball 31 betweenithe L Wedgingl surface 21 and the --interior of. the

socket 35 isclearly shown in Fig. 6'. A simie:

lar operation of parts is show'n'in Fig, '7 ,where'the wall of one of the threadsindi-Q cated 36 is slightlylmoved to the extent 5 fpermissable'iby the inherent resiliency of the,

material of; which such a, socket? is made.

The arrow 37 indicatesthe direction of the V unscrewing; of'the base 1'1 and the position I 1 v 1 i of the convolution indicatingthe'basethread w' with the correspondingithre'adji35'Qofl {the p I socket. It. is 3 the. angular relationship- ,of 1j these parts combined with the wedging 'ac- A ofthe surface 21and-theeccentric rela w tionshipp of 1 the socket and base-that' brings i aboutfaveryeflicient jamming action.

theft o One advantage'iofmy improved iproof device is that basesjlike those shown Y in. i the drawings may be" readily. manufac 1 'turedi f and" supplied j to the users since the is -the're shown" axially in angular position the ordinary'lmanner'. sires to have a theftproofilamplhe then een p isi rotatedin an I opposite direction as is the case when it is; desiredto remove the bulb, then the ball 81 standard base now in common use is simply",

provided with a washer such as shown in Fig.4, the member such as shown in Fig. 5 and the looking member 32 for the ball 31."

;The user may then determine whether he desires to use this base {for this lamp as a theft proof lamp or whether he wishes to' use it as a non-theft-proof lamp; Infthe latter case hezdoes'not havelto utilize "the locking member 31 or the other locking member 32 and-he simply uses the lamp base; in

e r, he dew-4,

places oneof the balls or'other locking ob struction in position preferably with the aid removedby destroying the glass bulb 10 after which the member27 is pulled out of 801 c o'fa little ax as a temporary holding means a v and thereby converts the .lampand base into a theft proof lamp. 7 If the lamp, has been used as a theftfproofflamp it canonly be c c the base l-l and by pullingJthe member :27 V

out'o'fitsposition, thatis, removing. the por-.

Y tion 2-6, the ball 31jcanfall into thefnotch I whichwith the removal ofthe locking means permits the. unlocking or the removal of the 20 and thereby be removed from the-same,

base;

'Ihave described and' shown anfe mbjodi-t I ment 'of my invention but it 'isclear; that changes may be 'made therein without deg parting from-the spirit of my invention; as i i i defined in the appended'claims. V I- claim as new-and desire. to secure-by; standardfithreaded socket 9 comprisingaf'standard threaded base, an

opening in the threaded portion of the base having an openingg'm'eans for hold Letters Patent:

1. A lamp for a ing a locking member and a; locking member adapted to be inserted into the opening and c held by" said ,means ',when s said lamp is to be rendered theft proof, and i designed to be entirely omitted therefrom gwhen said lamp is to befnon-theftproof. 2

2; A theft proof lampifor a standard threaded socket comprising a standard threaded base, the threaded portion ofthe base having an opening, asplit collar within the standard base, 'having'a notch andjacam;

face; and a locking member separate from I cam face'of the collarg 3. A theft 'proofflamptl ,c

the. collar and extending to; the; exterior of v the base a nd bulb, and looking member I within the tapering slot of the base and seated against the spring member in the notch. a. r

4. A'theft'proof lamp' according toc'lai'm 5 2', in whichfthe' locking ,-member protrudes from the base to the extent of the thread i cut away at theslot in thebasefl 5., A theft proof lamp", according and socket.

6. A theft proof lamppaocordingto claim w a 3, in which the extendingspring member I has corrugated portions in registration with the threads of the base, and the collar has peripheral portions toflbe engaged "by the base to prevent the collar from rotating.

7. A. theft proof lamp; according to claim 3, in which the spring member isadapted to be moved out of holdingnpositiontojrelease the locking member, to permitthe removal of the locking member and theremovalof the base from the socket." I '8. A theft roof lamp for a threaded socket comprising a threaded base, said base having an opening in its threaded portion, a

locking member adapted' to be disposed in the opejning and toprotrud'e beyondthe eX- v terior; surface or" -thefbase to engage the socket,'and means Within the, base for wedging the locking member against the Wallof the socket when the -base is-rotatedin one direction.

9. A-the:ft prooflamp'for a threaded socket comprising a threaded basepsaicl base having an opening in its threaded portion,.

and a locking member separate from' said lamp base, the opening being large enough '--to" perm-it the insertion of the locking member into the base, and means. carried by the base to'coo erate with the lockin member base having means to support said member for sliding Contact with the socket wall upon I threading the lamp base into the socket,' and cam "means carriedby-thelamp base and co .a'oting with said lockingmember upon turns-th la p se hegprp i e direction to project said member radially of theflamp base and into locking engagement with the 7 7 socket wall. p .u'fIn testimony that Iclaim' the foregoing as my invention,Ihavesignedm'y'namehereto.

M v LAMBERT SCIfIMIDT,

:to'claim a 2 in which locking action isaidedby the eccentric and angular relationship of the base 

